University:
University of Houston
Course:
MATH 2331 | Linear Algebra
Academic year:

2024
Views:

384

Pages:

9
Author:

Rosa Burke

11/10/2014 Quiz 8 You scored 100 out of 100 Question 1 Your answer is CORRECT. Which of the following would be the LSRL for the given data? w@JCillCKJOOCEJDIJ GJ[J[D[IJ[ill[JTIOIJ a) Q y = 42.82 + 1.625 X x=c(l ,4,8,12,15,19) > y=c(43,37,26,20,24, 11) > lm(y~x) @)@ y = 42.82 - 1.625 X Call: lm( fonnula = y ~ x) c) o y = -l.625 + 42. d) O y= Coefficients: (Intercept) x 42.815 -1.625 2x -1.625 - 42.82x e) 0 None of the above Question 2 Your answer is CORRECT. Determine the correlation coefficient for the data shown in this table: GJ[D[[J[DJDI]lli]DIJ G][fil[KJ[ill82J[ill[ill a) 0 -0.7019 ®'® 0.7019 x=c(3,6,11,13,l 6, 18) > y=c(22,28,27,40,27,43) > cor(x,y) [1] 0.7018695 c) 0 0.3509 1/9 Print Test 11/10/2014 d) 0 -0.4926 e) 0 0.4926 f) 0 None of the above Question 3 Your answer is CORRECT. Suppose you have the following data: 0[JITJ[IJITJ[IJ[IJ GJ[EJ[fil[fil[ill[ill[±O and the LSRL is y = 21.73 + 3.171 x . Find the residual value for x = l. a) 0 24 {S)@ c) o �L\) - ; L\) :: 2.41- - 241-- c,'I \-:: - 0 .'Io I -o.9m 24.901 d) O 0.9m e) 0 None of the above Question 4 Your answer is CORRECT. Which of the following is the residual plot for the data in the given table? 0[JITJ[IJITJ[IJ[IJ GJ[EJ[J[]OIJ[ill[ill[JIJ x=c(l,2,3,4,5,6) > y=c(14,19,18,32,23,31) > quizline=lrn(y~x) > plot(x,resid( quizline)) 219 Print Test 11/10/2014 4 3 0 2 0 0 3 4 5 6 -1 -2 0 -3 -4 a) 0 -5 0 0 co 0 � 'o�� &.,(� ""-·"""' a) 0 high incomes cause people to gain weight. \ ( f'. c,..,-M.C. �;. r::- N)Jtr �.-1 ��, b) 0 high incomes cause people to eat more food. t c) 0 high-income people tend to spend a greater proportion of their income on food than low-income people. 719 Print Test 11/10/2014 {1)@ high-income people tend to be heavier th� 1 '17-income people. £_ '�\Jtr (> M � e) 0 low incomes cause people to eat more food. »o Question 9 Your answer is CORRECT. The following two-way table describes the preferences in movies and fast food restaurants for a random sample of 100 people. I II McDonalds IIronMan II 20 IDispicableMell 10 !Harry Potter II 5 Taco Bell 12 11 15 Wendy's 8 7 12 What percent of people in the sample like the movie IronMan? 2.o -t \ 1... °'" a) 0 28% g - 'to 1o 100 \00 b) 0 27% 't,o c) 0 35% d) 0 38% @-!) 40% Question 10 Your answer is CORRECT. The following two-way table describes the preferences in movies and fast food restaurants for a random sample of 100 people. I II McDonald's II 20 !IronMan IDispicableMell 10 !Harry Potter II 9 3'1 Taco Bell 13 11 11 What percent of the IronMan lovers also like Taco Bell? 3S Wendy's 7 7 12 4to 1.g 12. 2.e- a) 0 40% b) 0 11% 8/9 11/10/2014 Print Test c) 19% d) 24% @· 33% 9/9

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